Patent US5336234A successfully refreshed from Google Patents.
US3787109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inside helmet sight apparatus
Assignee: Honeywell Inc
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Filing: 1972-06-28
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Granted: 1974-01-22
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Expires: 1992-06-28
Abstract
Abstract Helmet mounted display apparatus in which a reflective inside surface of a partially transparent visor is used as the primary optical element. A paraboloidal inside visor surface coated with a metallic film may be used. A light source image or a virtual image is positioned at the focal point of the inside surface of the visor. The outside surface of the visor may be coated with an anti-reflective coating.
Inventors
- 👤 R Vizenor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:30
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/017; G02B27/0172; A; A42; A42B; A42B3/00; A42B3/04; A42B3/0406; A42B3/042; G02B27/0101; G02B2027/0123; G02B27/0149; G02B2027/0154; G02B2027/0156
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
50 words
A head-mounted display system comprising: a. a partially transparent, partially refLective visor, one surface of said visor having a curvature for collimating light, the curvature having a definable focal point; and b. light emitting means positioned so that the light from said means appears to come from said focal point.
Claim 2
Dependent Claim
50 words
A head-mounted display system comprising: a. a partially transparent, partially refLective visor, one surface of said visor having a curvature for collimating light, the curvature having a definable focal point; and b. light emitting means positioned so that the light from said means appears to come from said focal point.
Claim 3
Dependent Claim
35 words
The apparatus as defined by claim 1 and means for mounting said visor in a fixed geometrical relationship to an observer''s head, so that said visor may move in consonance with the observer''s head movements.
Claim 4
Dependent Claim
15 words
The apparatus of claim 2 wherein said surface is defined by a paraboloid of revolution.
Claim 5
Dependent Claim
19 words
The apparatus of claim 2 wherein the light emitting means includes a light source centered at said focal point.
Claim 6
Dependent Claim
32 words
The apparatus of claim 2 wherein the light emitting means includes a light source and a mirror configured so that the virtual image of the source is centered at said focal point.
Claim 7
Dependent Claim
90 words
Visual display apparatus, which comprises: a. a visor having an inner concave parabolic surface which is partially reflective and partially transparent, said visor being of sufficient size to shield the eyes and forehead of an observer; b. a helmet to which the visor is mounted in such a manner that an observer wearing the helmet may have his eyes shielded by said visor; and c. light emitting means, fastened to the concave visor surface, for projecting an image which is centered at the focal point of the concave visor surface.
Claim 8
Dependent Claim
90 words
Visual display apparatus, which comprises: a. a visor having an inner concave parabolic surface which is partially reflective and partially transparent, said visor being of sufficient size to shield the eyes and forehead of an observer; b. a helmet to which the visor is mounted in such a manner that an observer wearing the helmet may have his eyes shielded by said visor; and c. light emitting means, fastened to the concave visor surface, for projecting an image which is centered at the focal point of the concave visor surface.
Claim 9
Dependent Claim
28 words
The apparatus of claim 5 wherein said light emitting means includes a light source and a substantially planar mirror placed at a predetermined angle to said light source.
Claim 10
Dependent Claim
13 words
The apparatus of claim 2 wherein the visor has a substantially spherical curvature.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |